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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34a90cd34cf8fa1f87fff603d78ed3a1159b12b6ec96222a50056e40a67ba83' 
  AND token = 'CW3LhURMp0c+fjCcmjR95jOHErtFr2crcs/eG/IYGZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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