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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf08e5d38b66127da99ac3f07211a97e6ce0744f87b2be06816dc57d1f8e005' 
  AND token = '5V1iLr3Z58aVw0gDOjrCcGMccbjqWFHSDqMOBDjvdhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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