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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b6689ce0dea3f168b0800d3d43c0c0f552812c79a23809bdb5b45bc1ca4025' 
  AND token = 'Hwc7TXpOhDVc5JnMW78x0iZCCB5iqAcKIVp3rQ/1cx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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