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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559a41ce79efe579c828d084cbf6d757ca71b6782c26e971adb7864db7b2367f' 
  AND token = 'snAWFXfFe3hV8rZj87uoESpDz1rgLrEv1mCzs3RD47U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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