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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fce4758237700f580ac2b3b8e7ef770aaf89dc0e680fc0e7cb502d45a4ca32' 
  AND token = 'hopTcLSHTJjjl42rqiaZa3q62hfbN6xVnc2z0hMvLd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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