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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b910b0869506c6719a3ce059c45b1fcd60a53e64249854ba7850cfc80a9e7768' 
  AND token = '9Uy5eOeo5m27eZ/qKLOwSYjjlbBBdvfBaybDGWO4abk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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