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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b8fe31d345694d4d45cd2bb77d888852bd2bba9a134fb36e83aefd4184a2bc' 
  AND token = 'D6PJMlBwsL0PmWIEPxFJBVw66Bq43p1ab8XnX8lxsFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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