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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6054591d3edb78c75a9ef641ce63c602381b47cb4931437e71e665868be245' 
  AND token = 'a3Osm7ygHVkrkWcUq7in6UbG8gZSN73ADi0wx/JDgXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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