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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2969e7c214d64d609bd9b9479c7e4a97bd6e7efc1f76dffb070f799b8de249' 
  AND token = 'jk5uyPtE0ZKFNpcHKqGn7KmHQSb9pbTEhFyAb6kxMzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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