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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0642ae3f43f6224a0f1101e4bf0fcafff40c4b986ea8dd37a1c132f395aecee0' 
  AND token = 'Abt1TmwCo0SDKjqr8iyUHrvb4/YmvAu+NP+oHKVFNWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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