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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec40ea8a5460e9f1fa4f384de57e6615bd3bb0cc6acd5de5fd8aa1fff36aaef' 
  AND token = 'pc/Cw39cz9blBfFMh6ImM83WdysyHH6hJld6cO55J20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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