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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff0a6b9e0eaf113d0b8770d7e68efd0414dd43dcab6f021bc69e08c79767010' 
  AND token = 'RyGzek2qWktGz4uv6iGP6Tz6D/F8piWH7M3kF9eHA+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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