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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679c9e69fcd8a189e6b8a4d189592d2c407e4a258ad22b5752255344e0e20f60' 
  AND token = 'BekOcgfrYtFUOeSpXm3gtuhM93arOIN8ui81YyePCcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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