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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b1880c2c3c2385ee0f9d43d21e469f4af985eb3c13327341a65f39a527547e' 
  AND token = 'WPxu347y/CnWIGz6aPa5ljGeV58zdMf++yyERbhfBKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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