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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696e0188e88ab6c5166484b43ee727e681d49c5c9baa2ce01a1fe28457aced43' 
  AND token = 'I6/UhMjMyaBJJUlpy9ItFMO7qrtwrFFpgv8kl1DMZB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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