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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9748ac6eeb326ae6e0532a4fa499ebb68400a6d1fbe2096911ce3263b5a49806' 
  AND token = 'xza4s4+ZtTvO//2gagQr1O+S0mCJp85U4rieybK7Hyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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