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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7840c2f41697359f95ed1f09e6c5b49d72b62aa32af622152d27989cb4e3619b' 
  AND token = 'jSzRnj8ln9Yf4qdAbSmBLWp7dYEZdVFUWitDO1XSAWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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