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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a34e4e71f8dac083d772e80ea5df4b99b4ee6f14508a8c1146da1cf77ed9115' 
  AND token = 'h17qWzmhsAaFdEudEA//HDd9p9U70Y21nNtx4RkNHig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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