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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fae51d978cbacf4b0f61389d3a72f6b92eb3c4037e2a1d3c47bce0830a61f9a' 
  AND token = 'WW56ywzu9MIq9u1Wkkh11TxBsgliiiWJ/tH0gKV0Tyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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