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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31f6ace8925e248db76c1735f60f76f51b264d73b36408cc9952de71d862dec' 
  AND token = 'wU+OaA8Lw5UN5HABEDmTEE/rVSUFLYvAbYTteH6mjfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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