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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546e2d9da6b48a8b65534c44738d6d542852a5bae2ae892f06eb28d8b6aae2b9' 
  AND token = '5x5b2Gb9GdZVePpaPqaFZ+lwleTDfHZdmbF4g/vvu5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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