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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1930175ab7c9335d93f4ac6ca334873200103ddf0ce1a37f634076d59ad0d054' 
  AND token = 'RlsHt9uR7NT7AeFv0fTmm6LOTr+WyD7HXRdiBcj0n30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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