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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb1bb0a218e2a4045baa2dd708b247fae24605dec217e5b15ffac5b0d8c63b6' 
  AND token = 'KDR2e+hk9mTZQxs75wcImcYURbzo63p25uxIE9jfCts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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