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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e76f98f1668f0f970f8d985818be27251237a22fe511c417f8a3512e5ba3f80' 
  AND token = 's3Vb+KI/DiUm8VLo3J+vnS+HA0lFE1qnJPwe7uMfwcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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