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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27917f0b30344284d951ad33f3819f61b64a66b668b4d6457087e6266b5310e8' 
  AND token = '+XnclIxzw6/pI6Izd3SZhs3qHyzQXuUkyE9fweP34CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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