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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c09eaf3f4a320309a199e27a6ef70eed294e70e047e7c9c5c647829530de52' 
  AND token = 'au6g4RwqCIv9fHmP9M6zsWO/P+oPG63Kw92QULMnChg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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