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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d5ca201c43e6cec7647879fa1f94bfae555587f63fdfa3d34659a069a32a28' 
  AND token = 'v1U5o5hGZ2dZEelolU2mgJft8LpgiyASVNlIdN78udc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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