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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee454e6db4de6a473a047c1dc1a3585711789ce10943a58ff284be3236e7a70' 
  AND token = '2CK5pGeA/Gbx4Y6cTuOxLbK+WvXMfRJu7tPMz5SihOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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