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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996e77b1251c32fef98ab53aa9a997d4b62390f7892dd8be0fb63f589c1ab77e' 
  AND token = 'xCAJMuO/BJUoUmAC/lN/NtkS7Ef98EV5Vpr+9G2h988=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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