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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68caa51b5468d0bfaf9ff98c52b84c36222c7eab3014baa5ffe2c0f59b42e2cf' 
  AND token = 'idClT00VkzwkEbgKzz6kHTaq0hlc9lDiETsNey9XiRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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