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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e35ab77c75b3c8e435cba1ed9065939924461c140e4fbd5e9f17b7c10aa1a59' 
  AND token = '4mSh+bjPTkDAUBXXasrelP+M5TkqWOhgtxmaXI7vr5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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