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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ba2abfeaf0570e22b6a561ef6b40cb7ff70f8a2665e03c5460d8f6555817fd' 
  AND token = 'AVBtZuDoqmrFQe7KcR61keJ4KBF6KT339ilo4bIsJfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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