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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92aaf02fd40148d04f0e1de0c5e5f87217d79db34bf700ca1900d35d60b10fd8' 
  AND token = 'B5mXZQFBUYdALZXS8nBTbq4UUUbu5OlN4JO/mudumY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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