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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61be27240eb59b09f98f0c24bc53ac0096bbdee3f3a3eca9aac8a0d305a544a6' 
  AND token = 'cIc8Xnj4iLKMuorXfXKzk1mtvYEPeuKUaJcvbHH42yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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