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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abdbb9c33b2f27fdba553ece2518d808bfc5da370197ac7f5724028635d2020' 
  AND token = 'lpblL9yHuN1Ma3LpW/jdb23YM6J8T3YdHMdG/fNXW5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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