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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc29fdcb45d9a6640801f836e9e69061cc79f745876e9b9ad80eb244ac6aef0' 
  AND token = 'pIcmajsI9N6C1rAXN2DhQ7cI1BEE4y1IWWRB98Ss1VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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