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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31433ed5479ce8823da74d0000a489e2fa5c956df86f38faedf78f23ebbf0320' 
  AND token = 'Mf1gOaA+qwCP8BAt0JIG2wZ97AUEjtGsmNk+krwaS44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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