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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0a1921ab67bd5b0675dc222ed8c3cbaa5fb5a5e1fc947a413ec8398ea74917' 
  AND token = 'gooxQtUI0BSyY9sBFe9M0y/VFOtDo1hzJvZZcu4ErEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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