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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab65e0e96bcdfac55b9d51af471b88d2a9fd47ee534cbb20af7440b491f824d' 
  AND token = 'RrRL6D8nTyFNr8PveFUlcrodO+ijWbDeMv5yOfPRwjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}