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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428344a38a1518bcd86019a990fb20dbdae0336a39e6700a87869040d0637c9f' 
  AND token = 'i5mP+uniNWGl5vY0UritSf2fUoNoDWpvXa5skLMxdbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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