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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec416dddbd56fc963d1e1ac1d91982ffd6d84d4913a06fd7cf6411892c0c7d7' 
  AND token = '7EJVPHlZm1EKIQUfSUZ19qOJPOTvolqKHCu0xUw/V3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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