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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9729a1e843166d2da1066f41b6a6b0395fd2f2e1dc178b2ec7d9749e3e9e016b' 
  AND token = 'mqwF9A9NvesWg4WdMGypI/m7VPQBqfRJuxYp381C7Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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