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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3c23fa770cc50ff5404f7a5147c4815a86978583b736e74b49917e1076fe63' 
  AND token = 'IQfaSKV/QuzBnzUX+szm7gaxdWVVjCk7l4HkE1DMV9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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