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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5c8670af176b588d88593b420dd3f2b7a06247033f9e76be62c17c10866c5a' 
  AND token = '0bRLg3LCTa81atLcsEDm0hWAGM1mbAwe9xnSjR1vGNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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