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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b399ee630d3160887d99f8b6aef354cd58a6b8c7e3af8d2506699c5f46d878e1' 
  AND token = '6UcCQ5V90UjM+6IHHsgfgyHj859cJ8KY3PrkZYyJIg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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