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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e2af6f3769db71ecae9242a2eb8b1e1be9dbdfd8874d51a9b5879d6abb4e10' 
  AND token = 'Jg4EXRhy3fu2P6R2amTtYaNb0DB0HqFbZT67jxWwSEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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