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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd7da793f8157a81df784b7cd2761c85f250fbddd9924f4c81170a7e23ad096' 
  AND token = 'TKw2Nc41BU4dCILgE0//GX7VAniFLsdAttxG3llwGQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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