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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8519daf4623c56d967122e258c1e0004ac3a77ab0fffec60066e6261b8ce0ebd' 
  AND token = 'Jf6Icchx06FzjxASi4BT7D68Pb6EJEYOCE6Vg5TtRaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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