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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2be92811ab35719dffb2b9f76d65748f5cafbda63e447ec037831b679c21ce' 
  AND token = 'xzUS9FONJ79BI59L3MFp7tP+5dR18ce0iufCL8+COxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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