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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48c21373a46fef58370092cbc8e0b13445aae6aa0912c8d34bb71a39593f8ec' 
  AND token = 'h3FJo2UyJRR75E7HqTZitLwkJBFLoTnS110Lpkt1JcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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