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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae446e1cf025ef62e3a229d874f22a74f15a062834d26e326a23cfb5614d22bf' 
  AND token = 'CtiucR41inI9qM4r5vh2C9Z3L6yjFvN2mjODNWkvQMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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