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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e189609bb64ae8dd9ce6eff86ae5f49ca5d0928dc5f8979eceebef772706a3' 
  AND token = 'lLYjdpSW5kQf2K6ZzAmeZ4Ok4whdjNJXsAUAsVJ/oJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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