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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa806a3ecd7da379757f1ee4e96f4574b1852c88334658c54e37f03384e9c514' 
  AND token = 'ElIIP09tIj0DxIn5NvMdEvfmwB1R6MqbElYJOaKFEyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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