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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52574e3fad7810be6a742c423539e7cba12136f66a5acdc6821af3b7c750a097' 
  AND token = 'mLkRQ1tlEw5Om7t3WleTFx+IQ742r00eC1NVu1GOveY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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