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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd035daea4956076da633e828f174b3a6f76874004ccd25c8da46dcedc9694ee' 
  AND token = 'Ebr4qOZoF6pLTAVOv6aW8ngzKV9dZtdJxypOuIRszxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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